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AN1537 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN1537
Description  A SIMPLE TRICK ENHANCES
PDF  18 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1537 Datasheet(HTML) 6 Page - STMicroelectronics

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AN1537 APPLICATION NOTE
6/18
Figure 5. 45W AC-DC adapter: fsw vs. Iout (left); Pin (@ Pout = 0) and fsw vs. ambient temperature (right)
Figure 6. 45W AC-DC adapter: waveforms @ Pout = 45W
Figure 7. 45W AC-DC adapter: waveforms @ Pout = 7W, just after the abrupt frequency shift
0.001
0.01
0.1
1
3
5
10
20
30
50
100
Iout [A]
fsw [kHz]
Tamb = 25 °C
Vin = 110 Vac, 230 Vac
-20
0
20
40
60
80
3
4
5
6
7
0.54
0.55
0.56
0.57
0.58
Tamb[°C]
fsw [kHz]
Pin [W]
fsw
Pin
Pout = 0 W
Vin = 264 Vac
RCT (pin 2 of L5991)
Q1 Drain
Vin = 220 Vac, Pout = 45W
RCT (pin 2 of L5991)
Q1 Drain
Vin = 110 Vac, Pout = 45W
Q1 Drain
Vin = 220 Vac, Pout = 7W
Q1 Drain
Vin = 110 Vac, Pout = 7W
RCT (pin 2 of L5991)
RCT (pin 2 of L5991)



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